SL34119N SLS [System Logic Semiconductor], SL34119N Datasheet - Page 3

• Manufacturer Part Number: SL34119N
• Description: Low Power Audio Amplifier
• Manufacturer: SLS [System Logic Semiconductor]

line powered speakerphone, for example, will require
more filtering than a circuit powered by a well
requlated power supply. The amount of rejection is a
function of the capacitors, and the equivalent
impedance looking into FC1 and FC2 (listed in the
Electrical Characteristics as R
affect the turn-on time of t h e circuit at power-up,
since the two capacitors must change up through the
internal 50 K
CHIP DISABLE
down the IC to conserve power, or for muting, or both.
When at a Logic “0” (0 to 0.8 Volts), the IL34119 is
enabled for normal operation. When Pin 1 is at a
Logic “1” (2.0 to V
is open, that is equivalent to a Logic “0”, although
good design practice dictates that an input should
never be left open. Input impedance at Pin 1 is a
nominal 90 K . The power supply current (when
disabled) is shown in Figure 1.
from normal operation to muted operation, is in excess
of 70 dB. The turn-off time of the audio output, from
the application of the CD signal, is <2.0 s, and turn
on-time is 12-15 ms. Both times are independent of C1,
C2, and V
FC1 and FC2 do not change as they are powered from
V
impedance condition, removing the signal from the
speaker. If signals from other sources are to be
applied to the outputs (while disabled), they must be
within the range of V
POWER DISSIPATION
the IC) for various combinations of V
MAXIMUM RATINGS
*
Functional operation should be restricted to the Recommended Operating Conditions.
CC
Maximum Ratings are those values beyond which damage to the device may occur.
Symbol
SLS
. The outputs, VO1 and VO2, change to a high
In addition to providing filtering, C1 and C2 also
The Chip Disable (Pin 1) can be used to power
Muting, defined as the change in differential gain
When the SL34119 is disabled, the voltages at
Figures 2-4 indicate the device dissipation (within
Tstg
I
V
V
V
OUT
VO
CC
IN
CC
System Logic
Semiconductor
.
Supply Voltage
Maximum Output Current at VO1, VO2
MaximumInput Voltage(FC1, FC2, CD, V
Applied Output Voltage to VO1, VO2 when disabled
Storage Temperature Range
and 125 K resistors.
CC
CC
Volts), the IC is disabled. If Pin 1
and Ground.
FC1
*
and R
FC2
Parameter
).
CC
, R
L
,
IN
)
and load power.The maximum power which can safely
be dissipated within the SL34119 is found from the
following equation:
P
where T
and
for the standard DIP package, and 180 C/W for the
surface mount package).
given application, is found from the following
eguation:
P
where I
and I
and R
curves), and a peak working load current of 200 mA,
define the operating range for the IL34119. The
operating range is further defined in terms of
allowable load power in Figure 8 for load of 8.0
16 , and 32
of the three curves is defined by the power level at
which 10% distortion occurs. The center flat portion
of each curve is defined by the maximum output
current capability of the SL34119. The right
(descending) portion of each curve is defined by the
maximum internal power dissipation of the IC at 25 C.
At higher operating be reduced according to the
above equations. Operating the device beyond the
current and junction temperature limits will degrade
long term reliability.
LAYOUT CONSIDERATIONS
the SL34119, unlike many other audio amplifiers.
However, the PC board layout, stray capacitances,
and the manner in which the speaker wires are
configured, may dictate otherwise. Generally the
speaker wires should be twisted tightly, and be not
more than a few inches in length.
D
D
= (140 C - T
= (V
The power dissipated within the SL34119, in a
Figures 2-4, along with Figures 5 -7 (distortion
Normally a snubber is not needed at the output of
RMS
L
JA
CC
is the load resistance.
CC
A
is the RMS current at the load;
is the package thermal resistance (100 C/W
x I
is the operating temperature;
is obtained from Figure 1;
CC
) + (I
A
. The left (ascending) portion of each
)/
RMS
JA
-1.0 toV
-1.0 toV
x V
-65 to +150
1.0 to +18
CC
Value
) - (R
250
CC
CC
+1.0
+1.0
L
x I
RMS
SL34119
2
).
Unit
mA
V
V
V
C
,